Should a mother who insults religion and prevents her son from gaining a deeper understanding of his faith be treated as a hostile infidel?

Cursing the religion is major disbelief and apostasy from the religion, unless one is coerced. Scholars have explicitly stated that whoever curses the religion has apostatized, even if it was unintentional, or due to ignorance or a slip of the tongue. Therefore, your mother, by cursing the religion of Allah, has committed an act that is considered disbelief. You must deal with her in the best manner, show her piety and kindness, while reminding her of the ugliness of her action with wisdom and supplicating for her guidance and repentance, without condoning her disbelief, but rather showing your disavowal and hatred for this act.